#ifndef XPathPredicate_H
#define XPathPredicate_H
#if XPATH_SUPPORT
#include "XPathExpressionNode.h"
namespace WebCore {
namespace XPath {
class Number : public Expression {
public:
Number(double);
bool isConstant() const;
private:
virtual Value doEvaluate() const;
double m_value;
};
class StringExpression : public Expression {
public:
StringExpression(const String&);
bool isConstant() const;
private:
virtual Value doEvaluate() const;
String m_value;
};
class Negative : public Expression {
private:
virtual Value doEvaluate() const;
};
class NumericOp : public Expression {
public:
enum Opcode {
OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod,
OP_GT, OP_LT, OP_GE, OP_LE
};
NumericOp(Opcode, Expression* lhs, Expression* rhs);
private:
virtual Value doEvaluate() const;
Opcode m_opcode;
};
class EqTestOp : public Expression {
public:
enum Opcode { OP_EQ, OP_NE };
EqTestOp(Opcode, Expression* lhs, Expression* rhs);
private:
virtual Value doEvaluate() const;
Opcode m_opcode;
};
class LogicalOp : public Expression {
public:
enum Opcode { OP_And, OP_Or };
LogicalOp(Opcode, Expression* lhs, Expression* rhs);
virtual bool isConstant() const;
private:
bool shortCircuitOn() const;
virtual Value doEvaluate() const;
Opcode m_opcode;
};
class Union : public Expression {
private:
virtual Value doEvaluate() const;
};
class Predicate : Noncopyable {
public:
Predicate(Expression*);
~Predicate();
bool evaluate() const;
void optimize();
private:
Expression* m_expr;
};
}
}
#endif // XPATH_SUPPORT
#endif // XPathPredicate_H